School-based policies: nutrition and physical activity.
D000293:Adolescent; D002648:Child; D015444:Exercise; D005260:Female; D006291:Health Policy; D006801:Humans; D009747:Nutritional Physiological Phenomena; D009765:Obesity / Q000517:prevention & control*; D012572:School Health Services / Q000331:legislation & jurisprudence*; D014481:United States